Voice conferencing Software..?

hey guys...
i have to conference with many people at a time.but i am not satisfied with present softwares.can anyone suggest any software which supports voice conference with quality voice even under firewall............

hmm... there r many... but depends on how many ppl u r going to have conference with .. u can use yahoo .. or skype.. or........behind the proxy u can try Dingotel(VOIP) ........www.dingotel.com

I recommend Skype, give it a go, its not bad..

I have got a slow bandwidth .. my voice conference with yahoo is not satisfactory.............is it okay for dingotel ?

Dingotel support to select audio codec..which helps you to get best performance in ur low bandwidth internet connection.skype performs not very well under slow bandwidth...

how do i know which codec is best for me ?

U have to check one by one as per as ur requirement (codec r listed using bandwidth level) ……..just concern when u get the best result.

I even use Skype on a dial up connection and it works not too bad. I wouldn't say it was perfect but pretty good considering the connection speed.